Bug 10771: remove disused statistical reports cronjobs

Bug 10771: remove disused statistical reports cronjobs

This patch removes three cronjobs that are believed to be
unused for the following reasons:

[1] The commit message that introduces them indicates that they
    were written for a particular library.  A staff member from
    that library has confirmed that they are not in use.
[2] The scripts have received essentially no patches since they
    were introduced except for being caught up in a broader
    code-improvement patch.
[3] They refer to a column that no longer exists in biblioitems.
[4] They no longer adhere to guidelines for command-line utilities,
    and there's been no sign that anybody has felt the urge to
    correct that.
[5] They are not referenced by another code or the manual, and
    the mailing list archives do not include any substantive discussion
    of their use.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>